Abstract
We describe in this paper the state of the art in the area of thermalhydraulic system codes assessment and uncertainty evaluation. System codes have been used in the past three decades in the areas of design, operation, licensing and safety of Nuclear Power Plants (NPP). Such applications require preliminary comprehensive code-user-nodalization qualification activities that we discuss in the paper. Although huge amounts of financial and human resources have been invested for the development and improvement of codes, including the user interface, the calculation results are still affected by erros. In the sophisticated nuclear technology, design and safety of NPP, these errors must be quantified. Therefore we propose uncertainty methodologies to achieve this goal. The reported analysis is based on the activities performed at University of Pisa and the experience we have acquired from the participation in a number of international projects.
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